Serial Number Detection with openCV

Question

I have a video with a serial number. Like in the picture. How I can with openCV detect the position of this patron. The only thing that I need is detect the location of this patron. Always this patron will have 12 numbers and will be white.

example

Answer 1

using Morphological Transformations you can find location of numbers.

try the code below (not a perfect code, it is just for instruction)

#include <opencv2/opencv.hpp>

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
    Mat src=imread("dnpaP.jpg");
    Mat thresh = src.clone();

    dilate(thresh,thresh,Mat(),Point(-1,-1), 5);
    erode(thresh,thresh,Mat(),Point(-1,-1), 5);
    cvtColor(thresh, thresh, COLOR_BGR2GRAY);
    threshold(thresh, thresh, 200, 255, THRESH_BINARY);
    erode(thresh,thresh,Mat(),Point(-1,-1), 3);
    dilate(thresh,thresh,Mat(),Point(-1,-1), 3);

    vector<vector<Point> > contours;

    findContours(thresh.clone(), contours, RETR_LIST, CHAIN_APPROX_SIMPLE);

    for( size_t i = 0; i< contours.size(); i++ )
    {
        Rect boundingRect_ = boundingRect( contours[i] );
        if(boundingRect_.width > boundingRect_.height * 12)
        rectangle(src,boundingRect_,Scalar(0,0,255),2);
    }
    imshow("thresh",thresh);
    imshow("src",src);
    waitKey();
}